Index: src/os_win.c
==================================================================
--- src/os_win.c
+++ src/os_win.c
@@ -282,12 +282,11 @@
 #endif
 #if SQLITE_MAX_MMAP_SIZE>0
   int nFetchOut;                /* Number of outstanding xFetch references */
   HANDLE hMap;                  /* Handle for accessing memory mapping */
   void *pMapRegion;             /* Area memory mapped */
-  sqlite3_int64 mmapSize;       /* Usable size of mapped region */
-  sqlite3_int64 mmapSizeActual; /* Actual size of mapped region */
+  sqlite3_int64 mmapSize;       /* Size of mapped region */
   sqlite3_int64 mmapSizeMax;    /* Configured FCNTL_MMAP_SIZE value */
 #endif
 };
 
 /*
@@ -4332,13 +4331,13 @@
 */
 #if SQLITE_MAX_MMAP_SIZE>0
 static int winUnmapfile(winFile *pFile){
   assert( pFile!=0 );
   OSTRACE(("UNMAP-FILE pid=%lu, pFile=%p, hMap=%p, pMapRegion=%p, "
-           "mmapSize=%lld, mmapSizeActual=%lld, mmapSizeMax=%lld\n",
+           "mmapSize=%lld, mmapSizeMax=%lld\n",
            osGetCurrentProcessId(), pFile, pFile->hMap, pFile->pMapRegion,
-           pFile->mmapSize, pFile->mmapSizeActual, pFile->mmapSizeMax));
+           pFile->mmapSize, pFile->mmapSizeMax));
   if( pFile->pMapRegion ){
     if( !osUnmapViewOfFile(pFile->pMapRegion) ){
       pFile->lastErrno = osGetLastError();
       OSTRACE(("UNMAP-FILE pid=%lu, pFile=%p, pMapRegion=%p, "
                "rc=SQLITE_IOERR_MMAP\n", osGetCurrentProcessId(), pFile,
@@ -4346,11 +4345,10 @@
       return winLogError(SQLITE_IOERR_MMAP, pFile->lastErrno,
                          "winUnmapfile1", pFile->zPath);
     }
     pFile->pMapRegion = 0;
     pFile->mmapSize = 0;
-    pFile->mmapSizeActual = 0;
   }
   if( pFile->hMap!=NULL ){
     if( !osCloseHandle(pFile->hMap) ){
       pFile->lastErrno = osGetLastError();
       OSTRACE(("UNMAP-FILE pid=%lu, pFile=%p, hMap=%p, rc=SQLITE_IOERR_MMAP\n",
@@ -4457,11 +4455,10 @@
                osGetCurrentProcessId(), pFd, sqlite3ErrName(rc)));
       return SQLITE_OK;
     }
     pFd->pMapRegion = pNew;
     pFd->mmapSize = nMap;
-    pFd->mmapSizeActual = nMap;
   }
 
   OSTRACE(("MAP-FILE pid=%lu, pFile=%p, rc=SQLITE_OK\n",
            osGetCurrentProcessId(), pFd));
   return SQLITE_OK;
@@ -5259,11 +5256,10 @@
   pFile->zPath = zName;
 #if SQLITE_MAX_MMAP_SIZE>0
   pFile->hMap = NULL;
   pFile->pMapRegion = 0;
   pFile->mmapSize = 0;
-  pFile->mmapSizeActual = 0;
   pFile->mmapSizeMax = sqlite3GlobalConfig.szMmap;
 #endif
 
   OpenCounter(+1);
   return rc;